CH 1: Molecules of Life
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Questions and Answers

What is the smallest unit of matter that retains the properties of an element?

  • Atom (correct)
  • Molecule
  • Proton
  • Electron

Which element is NOT listed as essential to life in the text?

  • Oxygen (O)
  • Sodium (Na)
  • Phosphorus (P) (correct)
  • Iron (Fe)

What type of bond is formed when atoms share electrons?

  • Covalent bond (correct)
  • Ionic bond
  • Metallic bond
  • Hydrogen bond

Which category do organic and inorganic compounds fall into based on their composition?

<p>Organic and Inorganic Compounds (A)</p> Signup and view all the answers

What is the term for the smallest particle of a substance that retains its chemical properties?

<p>Molecule (D)</p> Signup and view all the answers

What type of bonds are typically found in organic compounds?

<p>Carbon-Hydrogen (C-H) bonds (C)</p> Signup and view all the answers

Which of the following is NOT an example of an organic compound?

<p>Carbon dioxide (A)</p> Signup and view all the answers

What is the primary function of fats in living organisms?

<p>Energy storage (B)</p> Signup and view all the answers

Which organic compound makes up the highest percentage of human body mass (excluding water)?

<p>Proteins (A)</p> Signup and view all the answers

Which organic compound is crucial for storing and transmitting genetic information?

<p>Nucleic acids (B)</p> Signup and view all the answers

What is the primary function of nucleic acids in living organisms?

<p>Genetic information storage and transmission (C)</p> Signup and view all the answers

Which of the following compounds is characterized by the absence of hydrogen despite containing carbon?

<p>Carbon dioxide (C)</p> Signup and view all the answers

In the context of living organisms, which substance makes up the second-highest percentage of human body mass after water?

<p>Proteins (A)</p> Signup and view all the answers

What is the main role of carbohydrates in living organisms?

<p>Energy storage and structural functions (B)</p> Signup and view all the answers

Which type of bond is typically missing in inorganic compounds like carbon dioxide?

<p>Hydrogen bond (A)</p> Signup and view all the answers

Which element is known to be crucial for forming the backbone of RNA and DNA molecules?

<p>Phosphorus (A)</p> Signup and view all the answers

Which element is essential for the production of hemoglobin molecules in the human body?

<p>Iron (B)</p> Signup and view all the answers

Which of the following compounds is NOT considered an organic compound?

<p>Carbon dioxide (D)</p> Signup and view all the answers

Which of the following molecules is composed of the same element?

<p>O2 (D)</p> Signup and view all the answers

Which of the following molecules is considered a compound, not just a molecule?

<p>O3 (D)</p> Signup and view all the answers

Which organic compound is involved in the formation of the cell membrane and has a primary function other than energy storage and structural support?

<p>Fats (D)</p> Signup and view all the answers

Which of the following organic compounds has the highest percentage composition in humans, excluding water?

<p>Proteins (C)</p> Signup and view all the answers

Which organic compound is not directly involved in energy storage, but plays a crucial role in genetic information storage and transmission?

<p>Nucleic Acids (B)</p> Signup and view all the answers

Which element is present in all major organic compounds mentioned in the text but is not listed as an essential life element?

<p>Carbon (A)</p> Signup and view all the answers

Which organic compound, despite being essential for genetic information storage and transmission, has the lowest percentage composition in humans?

<p>Nucleic Acids (B)</p> Signup and view all the answers

Which pair of elements is most likely to form a covalent bond in the context of living organisms?

<p>Oxygen (O) and Hydrogen (H) (C)</p> Signup and view all the answers

Which of the following molecules is not considered an organic compound in the context of living organisms?

<p>Carbon dioxide (CO2) (A)</p> Signup and view all the answers

Which element is known to be crucial for forming the backbone of RNA and DNA molecules?

<p>Phosphorus (P) (D)</p> Signup and view all the answers

Which of the following compounds is characterized by the absence of hydrogen despite containing carbon?

<p>Carbon dioxide (CO2) (D)</p> Signup and view all the answers

What type of bond is formed when atoms share electrons unequally in the context of living organisms?

<p>Polar covalent bond (B)</p> Signup and view all the answers

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